<?php

/**
 * Power By Tmac PHP MVC framework
 * $Author: zwt007 $  <zwttmac@qq.com>
 * $Id: Template.class.php 31 2011-07-11 15:25:51Z zwt007 $
 * http://www.t-mac.org；
 * ---------------------------------------------------
 * 模板类 - 使用 Discuz 模板引擎解析
 * ---------------------------------------------------
 */
class Template
{
    const DIR_SEP = DIRECTORY_SEPARATOR;

    /**
     * 模板实例
     *
     * @staticvar
     * @var object Template
     */
    protected static $_instance;
    /**
     * 模板参数信息
     *
     * @var array
     */
    protected $_options = array();

    /**
     * 单件模式调用方法
     *
     * @static
     * @return object Template
     */
    public static function getInstance()
    {
        if (!self::$_instance instanceof self)
            self::$_instance = new self();
        return self::$_instance;
    }

    /**
     * 构造方法
     *
     * @return void
     */
    private function __construct()
    {
        $this->_options = array(
            'template_dir' => APPLICATION_ROOT . 'View', //设置系统模板文件的存放目录
            'cache_dir' => VAR_ROOT . 'Cache' . self::DIR_SEP . 'template' . self::DIR_SEP, //缓存文件存放目录
            'auto_update' => false, //当模板文件改动时是否重新生成缓存
            'cache_lifetime' => 0, //缓存生命周期(分钟)，为 0 表示永久
            'suffix' => '.html', //模板文件后缀
            'cache_open' => false               //是否开启缓存，程序调试时使用
        );
    }

    /**
     * 设定模板参数信息
     *
     * @param  array $options 参数数组
     * @return void
     */
    public function setOptions(array $options)
    {
        foreach ($options as $name => $value)
            $this->set($name, $value);
    }

    /**
     * 设定模板参数
     *
     * @param  string $name  参数名称
     * @param  mixed  $value 参数值
     * @return void
     */
    public function set($name, $value)
    {
        switch ($name)
        {
            case 'template_dir':
                $value = $this->_trimpath($value);
                if (!file_exists($value))
                    throw new TmacException("未找到指定的模板目录 \"$value\"");
                $this->_options['template_dir'] = $value;
                break;
            case 'cache_dir':
                $value = $this->_trimpath($value);
                if (!file_exists($value))
                    throw new TmacException("未找到指定的缓存目录 \"$value\"");
                $this->_options['cache_dir'] = $value;
                break;
            case 'auto_update':
                $this->_options['auto_update'] = (boolean) $value;
                break;
            case 'cache_lifetime':
                $this->_options['cache_lifetime'] = (float) $value;
                break;
            case 'suffix':
                $this->_options['suffix'] = $value;
                break;
            case 'cache_open':
                $this->_options['cache_open'] = $value;
                break;
            default:
                throw new TmacException("未知的模板配置选项 \"$name\"");
        }
    }

    /**
     * 通过魔术方法设定模板参数
     *
     * @see    Template::set()
     * @param  string $name  参数名称
     * @param  mixed  $value 参数值
     * @return void
     */
    public function __set($name, $value)
    {
        $this->set($name, $value);
    }

    /**
     * 缓存是否开启
     *
     * @return boolean
     */
    public function isCacheOpened()
    {
        return $this->_options['cache_open'];
    }

    /**
     * 获取模板文件
     *
     * @param  string $file 模板文件名称
     * @return string
     */
    public function getfile($file)
    {
        $file = $file . $this->_options['suffix'];   //设置模板文件后缀
        $cachefile = $this->_getCacheFile($file);
        if ($this->isCacheOpened()) {
            if (!file_exists($cachefile))
                $this->cache($file);
        }
        else {
            $this->cache($file);
        }
        return $cachefile;
    }

    /**
     * 打印模板
     *
     * @param string $file 模板名
     */
    public function show($file)
    {
        $file = $this->getfile($file);
        if (is_file($file)) {
            // 模板阵列变量分解成为独立变量
            @extract($this->value);
            include($file);
        } else {
            throw new TmacException('找不到模板文件:' . $file);
        }
    }

    /**
     * 检测模板文件是否需要更新缓存
     *
     * @param  string  $file    模板文件名称
     * @param  string  $md5data 模板文件 md5 校验信息
     * @param  integer $md5data 模板文件到期时间校验信息
     * @return void
     */
    public function check($file, $md5data, $expireTime)
    {
        if ($this->_options['auto_update']
                && md5_file($this->_getTplFile($file)) != $md5data)
            $this->cache($file);
        if ($this->_options['cache_lifetime'] != 0
                && (time() - $expireTime >= $this->_options['cache_lifetime'] * 60))
            $this->cache($file);
    }

    /**
     * 对模板文件进行缓存
     *
     * @param  string  $file    模板文件名称
     * @return void
     */
    public function cache($file)
    {
        $tplfile = $this->_getTplFile($file);

        if (!is_readable($tplfile)) {
            throw new TmacException("模板文件 \"$tplfile\" 未找到或者无法打开");
        }
        //取得模板内容
        $template = file_get_contents($tplfile);

        //过滤 <!--{}-->
        $template = preg_replace("/\<\!\-\-\{(.+?)\}\-\-\>/s", "{\\1}", $template);

        //替换语言包变量
        //$template = preg_replace("/\{lang\s+(.+?)\}/ies", "languagevar('\\1')", $template);
        //替换 PHP 换行符
        $template = str_replace("{LF}", "<?php echo \"\\n\";?>", $template);

        //替换{和} 大小括号
        $template = str_replace("^{", "&#123", $template);
        $template = str_replace("}^", "&#125", $template);

        //替换直接变量输出
        $varRegexp = "((\\\$[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)"
                . "(\[[a-zA-Z0-9_\-\.\"\'\[\]\$\x7f-\xff]+\])*)";
        $template = preg_replace("/\{(\\\$[a-zA-Z0-9_\[\]\'\"\$\.\x7f-\xff]+)\}/s", "<?php echo \\1;?>", $template);
        $template = preg_replace("/$varRegexp/es", "\$this->addquote('<?php echo \\1;?>')", $template);
        $template = preg_replace("/\<\?php echo \<\?php echo $varRegexp;\?\>;\?\>/es", "\$this->addquote('<?php echo \\1;?>')", $template);

        //替换前台模板载入命令|edit
        $template = preg_replace(
                        "/[\n\r\t]*\{template\s+(.+?)\}[\n\r\t]*/is",
                        "\r\n<?php self::show('{$GLOBALS['TmacConfig']['Template']['template_dir']}/\\1'); ?>\r\n",
                        $template
        );
        //通用模板替换{tpl 'admin/index'}
        $template = preg_replace(
                        "/[\n\r\t]*\{tpl\s+(.+?)\}[\n\r\t]*/is",
                        "\r\n<?php self::show(\\1); ?>\r\n",
                        $template
        );
        //|edit
        $template = preg_replace(
                        "/[\n\r\t]*\{template\s+(.+?)\}[\n\r\t]*/is",
                        "\r\n<?php self::show(\\1); ?>\r\n",
                        $template
        );
        //替换特定函数
        $template = preg_replace(
                        "/[\n\r\t]*\{eval\s+(.+?)\}[\n\r\t]*/ies",
                        "\$this->stripvtags('<?php \\1 ?>','')",
                        $template
        );
        /*替换${} <?php ?>*/
        $template = preg_replace(
                        "/[\n\r\t]*\\\${(.+?)\}[\n\r\t]*/ies",
                        "\$this->stripvtags('<?php \\1 ?>','')",
                        $template
        );
        $template = preg_replace(
                        "/[\n\r\t]*\{echo\s+(.+?)\}[\n\r\t]*/ies",
                        "\$this->stripvtags('<?php echo \\1; ?>','')",
                        $template
        );
        $template = preg_replace(
                        "/([\n\r\t]*)\{elseif\s+(.+?)\}([\n\r\t]*)/ies",
                        "\$this->stripvtags('\\1<?php } elseif(\\2) { ?>\\3','')",
                        $template
        );
        $template = preg_replace(
                        "/([\n\r\t]*)\{else\}([\n\r\t]*)/is",
                        "\\1<?php } else { ?>\\2",
                        $template
        );

        
        //替换循环函数及条件判断语句
        $template = preg_replace("/\{if\s+(.+?)\}/ies", "\$this->stripvtags('<?php if(\\1) { ?>','')", $template);
        $template = preg_replace("/\{else\}/ies", "\$this->stripvtags('<?php } else { ?>','')", $template);
        $template = preg_replace("/\{elseif\s+(.+?)\}/ies", "\$this->stripvtags('<?php } elseif (\\1) { ?>','')", $template);
        $template = preg_replace("/\{\/if\}/ies", "\$this->stripvtags('<?php } ?>','')", $template);
        $template = preg_replace("/\{loop\s+\<\?php echo (\S+);\?\>\s+\<\?php echo (\S+);\?\>\}/ies", "\$this->stripvtags('<?php if(is_array(\\1)) foreach(\\1 AS \\2) { ?>','')", $template);
        $template = preg_replace("/\{loop\s+\<\?php echo (\S+);\?\>\s+\<\?php echo (\S+);\?\>\s+\<\?php echo (\S+);\?\>\}/ies", "\$this->stripvtags('\n<?php if(is_array(\\1)) foreach(\\1 AS \\2 => \\3) { ?>','')", $template);
        $template = preg_replace("/\{\/loop\}/ies", "\$this->stripvtags('\n<?php } ?>\n','')", $template);

        //常量替换
        $template = preg_replace(
                        "/\{([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)\}/s",
                        "<?php echo \\1; ?>",
                        $template
        );

        //删除 PHP 代码断间多余的空格及换行
        $template = preg_replace("/ \?\>[\n\r]*\<\?php /s", " ", $template);

        //其他替换
        $template = preg_replace(
                        "/\"(http)?[\w\.\/:]+\?[^\"]+?&[^\"]+?\"/e",
                        "\$this->transamp('\\0')",
                        $template
        );
        $template = preg_replace(
                        "/\<script[^\>]*?src=\"(.+?)\".*?\>\s*\<\/script\>/ise",
                        "\$this->stripscriptamp('\\1')",
                        $template
        );
        $template = preg_replace(
                        "/[\n\r\t]*\{block\s+([a-zA-Z0-9_]+)\}(.+?)\{\/block\}/ies",
                        "\$this->stripblock('\\1', '\\2')",
                        $template
        );

        //添加 md5 及过期校验
        $md5data = md5_file($tplfile);
        $expireTime = time();
        $template = "<?php if (!class_exists('template')) die('Access Denied');"
                . "self::check('$file', '$md5data', $expireTime);"
                . "?>\r\n$template";

        //写入缓存文件
        $cachefile = $this->_getCacheFile($file);
        $makepath = $this->_makepath($cachefile);
        if ($makepath !== true)
            throw new TmacException("无法创建缓存目录 \"$makepath\"");
        file_put_contents($cachefile, $template);
    }

    /**
     * 将路径修正为适合操作系统的形式
     *
     * @param  string $path 路径名称
     * @return string
     */
    protected function _trimpath($path)
    {
        return str_replace(array('/', '\\', '//', '\\\\'), self::DIR_SEP, $path);
    }

    /**
     * 获取模板文件名及路径
     *
     * @param  string $file 模板文件名称
     * @return string
     */
    protected function _getTplFile($file)
    {
        return $this->_trimpath($this->_options['template_dir'] . self::DIR_SEP . $file);
    }

    /**
     * 获取模板缓存文件名及路径
     *
     * @param  string $file 模板文件名称
     * @return string
     */
    protected function _getCacheFile($file)
    {
        $file = preg_replace('/\.[a-z0-9\-_]+$/i', '.cache.php', $file);
        return $this->_trimpath($this->_options['cache_dir'] . self::DIR_SEP . $file);
    }

    /**
     * 根据指定的路径创建不存在的文件夹
     *
     * @param  string  $path 路径/文件夹名称
     * @return string
     */
    protected function _makepath($path)
    {
        /*      $dirs = explode(self::DIR_SEP, dirname($this->_trimpath($path)));
          $tmp = '';
          foreach ($dirs as $dir) {
          $tmp .= $dir . self::DIR_SEP;
          if (!file_exists($tmp) && !@mkdir($tmp, 0777))
          return $tmp;
          } */
        $dirs = dirname($this->_trimpath($path));
        if (!file_exists($dirs) && !@mkdir($dirs, 0777)) {
            return $dirs;
        }
        return true;
    }

    /**
     * 分配变量
     *
     * @param string $key 模板变量名
     * @param mixed $value 模板变量的值
     * @return void
     */
    public function assign($key, $value)
    {
        $this->value[$key] = $value;
    }

    /**
     * 通过数组分配变量
     *
     * @param array $array
     */
    public function assignByArray($array)
    {
        if (is_array($array)) {
            foreach ($array as $k => $v) {
                $this->value[$k] = $v;
            }
        }
    }

#----------------------------------
//以下是模板替换中需要用到的函数
#----------------------------------

    /**
     * 替换&,&amp;amp;,\" 为正常
     * @param $template 模板文件
     */
    public function transamp($template)
    {
//        $template = str_replace('&', '&amp;', $template);
        $template = str_replace('&amp;amp;', '&amp;', $template);
        $template = str_replace('\"', '"', $template);
        return $template;
    }

    /**
     * 替换tag中的反斜线
     */
    public function stripvtags($expr, $statement)
    {
        $expr = str_replace("\\\"", "\"", preg_replace("/\<\?php echo (\\\$.+?);\?\>/s", "\\1", $expr));
        $statement = str_replace("\\\"", "\"", $statement);
        return $expr . $statement;
    }

    public function addquote($var)
    {
        return str_replace("\\\"", "\"", preg_replace("/\[([a-zA-Z0-9_\-\.\x7f-\xff]+)\]/s", "['\\1']", $var));
    }

    public function stripscriptamp($s)
    {
        $s = str_replace('&amp;', '&', $s);
        return "<script src=\"$s\" type=\"text/javascript\"></script>";
    }

    public function stripblock($var, $s)
    {
        $s = str_replace('\\"', '"', $s);
        $s = preg_replace("/<\?php echo \\\$(.+?);\?>/", "{\$\\1}", $s);
        preg_match_all("/<\?php echo (.+?);\?>/e", $s, $constary);
        $constadd = '';
        $constary[1] = array_unique($constary[1]);
        foreach ($constary[1] as $const) {
            $constadd .= '$__' . $const . ' = ' . $const . ';';
        }
        $s = preg_replace("/<\?php echo (.+?);\?>/", "{\$__\\1}", $s);
        $s = str_replace('?>', "\n\$$var .= <<<EOF\n", $s);
        $s = str_replace('<?', "\nEOF;\n", $s);
        return "<?php \n$constadd\$$var = <<<EOF\n" . $s . "\nEOF;\n?>";
    }

}